Patent · US Active

Screw element having an axially asymmetrical screw profile which has at least two construction points located within the screw profile

US12370510B2 · kind B2 · utility

0Cited by

4References

17Claims

0Family size

Assignee

Covestro Intellectual Property GmbH & Co. KG · DE

Inventors

Birgit Mannel · Mülheim an der Ruhr, DE
Reiner Rudolf · Leverkusen, DE
Michael Bierdel · Leverkusen, DE
Carsten Conzen · Leverkusen, DE

Key dates

Filing date	Feb 17, 2020
Grant date	Jul 29, 2025
Priority date	—
Expiry date	Oct 8, 2042

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01F2215/0431
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A screw element which has an axially asymmetrical screw cross-sectional profile which has at least two construction points located within the screw cross-sectional profile is provided. The screw element is suitable for use in an extruder having two drive shafts which rotate in the same direction and at the same speed, in order to process or produce plastic masses as an extrudate. Also, an arrangement of two identical or different screw elements in an extruder having two drive shafts which rotate in the same direction and at the same speed is provided. An extruder which is equipped with two identical or different screw elements and has two drive shafts which rotate in the same direction and at the same speed is provided. Furthermore, the use of the screw element according to the invention for processing or producing plastic masses is provided.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.